8378746: ZGC: jdk/jfr/event/gc/detailed/TestZRelocationSetGroupEvent.java intermittent OOME

[sendaoYan]

Hi all,

This pull request contains a backport of commit e22c95cd from the openjdk/jdk repository.

The commit being backported was authored by SendaoYan on 9 Mar 2026 and was reviewed by Stefan Karlsson and Albert Mingkun Yang.

Thanks!

---

Progress

• Change must not contain extraneous whitespace
• JDK-8378746 needs maintainer approval
• Commit message must refer to an issue

Issue

• JDK-8378746: ZGC: jdk/jfr/event/gc/detailed/TestZRelocationSetGroupEvent.java intermittent OOME (Bug - P4 - Approved)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/jdk26u.git pull/100/head:pull/100
$ git checkout pull/100

Update a local copy of the PR:
$ git checkout pull/100
$ git pull https://git.openjdk.org/jdk26u.git pull/100/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 100

View PR using the GUI difftool:
$ git pr show -t 100

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/jdk26u/pull/100.diff

Using Webrev

Link to Webrev Comment

[sendaoYan]

Change has been verified locally on linux-x64.

[bridgekeeper]

👋 Welcome back syan! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

@sendaoYan This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8378746: ZGC: jdk/jfr/event/gc/detailed/TestZRelocationSetGroupEvent.java intermittent OOME

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 52 new commits pushed to the master branch:

• 7f631ea: 8378713: C2: performance regression due to missing constant folding for Math.pow()
• d8f0700: 8375294: (fs) Files.copy can fail with EOPNOTSUPP when copy_file_range not supported
• 2aec1ce: 8381596: Adjust checks which use supports_ht() on x86 for hybrid CPUs
• ... and 49 more: https://git.openjdk.org/jdk26u/compare/940665a766fa7e867999dac1ba82b8a8933dbeed...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

➡️ To integrate this PR with the above commit message to the master branch, type /integrate in a new comment.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[openjdk]

⚠️ @sendaoYan This change is now ready for you to apply for maintainer approval. This can be done directly in each associated issue or by using the /approval command.

[mlbridge]

Webrevs

• 00: Full (8381daff)

[bridgekeeper]

@sendaoYan This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply issue a /touch or /keepalive command to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

[sendaoYan]

/approval request Clean backport to fix the test bug which cause test intermittent fails. Change has been verified locally on linux-64. Test-fix only, no risk.

[openjdk]

@sendaoYan
8378746: The approval request has been created successfully.

[sendaoYan]

GHA report "linux-x64" and "linux-64 static" fails at "Get bundles" stage. Seems like environmental issue or infrastructure issue. It's unrelated to this backport PR.